Telit Wireless Solutions GE863-QUAD - Manual (Page 23)

GE863-QUAD
GE863-PY
1vv0300715 Rev. 1 - 19/09/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 23 of 79
This device is to be used only for mobile and fixed application. The antenna(s) used for this transmitter
must be installed to provide a separation distance of at least 20 cm from all persons and must not be
co-located or operating in conjunction with any other antenna or transmitter. End-Users must be
provided with transmitter operation conditions for satisfying RF exposure compliance. OEM integrators
must ensure that the end user has no manual instructions to remove or install the GE863-QUAD/PY
module. Antennas used for this OEM module must not exceed 3dBi gain for mobile and fixed
operating configurations.
5.2 GSM Antenna - PCB line Guidelines
• Ensure that the antenna line impedance is 50 ohm;
• Keep the antenna line on the PCB as short as possible, since the antenna line loss shall be less
than 0,3 dB;
• Antenna line must have uniform characteristics, constant cross section, avoid meanders and
abrupt curves;
• Keep, if possible, one layer of the PCB used only for the Ground plane;
• Surround (on the sides, over and under) the antenna line on PCB with Ground, avoid having other
signal tracks facing directly the antenna line track;
• The ground around the antenna line on PCB has to be strictly connected to the Ground Plane by
placing vias once per 2mm at least;
• Place EM noisy devices as far as possible from GE863-QUAD/PY antenna line;
• Keep the antenna line far away from the GE863-QUAD/PY power supply lines;
• If you have EM noisy devices around the PCB hosting the GE863-QUAD/PY, such as fast
switching ICs, take care of the shielding of the antenna line by burying it inside the layers of PCB
and surround it with Ground planes, or shield it with a metal frame cover.
• If you don't have EM noisy devices around the PCB of GE863-QUAD/PY, by using a strip-line on
the superficial copper layer for the antenna line, the line attenuation will be lower than a buried
one;
5.3 GSM Antenna - installation Guidelines
• Install the antenna in a place covered by the GSM signal.
• The Antenna must be installed to provide a separation distance of at least 20 cm from all persons
and must not be co-located or operating in conjunction with any other antenna or transmitter;
• Antenna shall not be installed inside metal cases
• Antenna shall be installed also according Antenna manufacturer instructions.
6 Serial Ports
The serial port on the Telit GE863-QUAD/PY is the core of the interface between the module and
OEM hardware.
2 serial ports are available on the module: